...I don't know of a single cowboy action shooter who reloads using black powder (I know there are probably a few but I have never met or seen one)

GoodOlBoy

Surprisingly most of the those who shoot cowboy action at my club tell me that they handload with black powder. I can't imagine why - all the extra effort at cleaning, etc. - just to have a big, smelly cloud after the shot. I Just figured it was a cowboy action thing.